Product Name: SPECFLEX* NS 1540 Isocyanate DA Issue Date: 04/17/2012

Print Date: 18 Apr 2012

®(TM)*Trademark

Page 1 of 10

The Dow Chemical Company encourages and expects you to read and understand the entire (M)SDS, 

as there is important information throughout the document. We expect you to follow the precautions 

identified in this document unless your use conditions would necessitate other appropriate methods or 

actions.

1. Product and Company Identification

Product Name

SPECFLEX* NS 1540 Isocyanate DA

COMPANY IDENTIFICATION

The Dow Chemical Company

2030 Willard H. Dow Center

Midland, MI 48674

United States

Customer Information Number: 800-258-2436

EMERGENCY TELEPHONE NUMBER

24-Hour Emergency Contact: 989-636-4400

Local Emergency Contact: 989-636-4400

2. Hazards Identification

Emergency Overview

Color: Brown 

Physical State: Liquid.

Odor: Musty

Hazards of product:

WARNING! May cause allergic skin reaction. May cause allergic respiratory reaction. 

May cause lung injury. May cause eye irritation. May cause skin irritation. May cause 

respiratory tract irritation. Sprayed or heated material harmful if inhaled. Toxic fumes 

may be released in fire situations. May react with water. Elevated temperatures can 

cause hazardous polymerization. Material reacts slowly with water, releasing carbon 

dioxide which can cause pressure buildup and rupture of closed containers. Elevated 

temperatures accelerate this reaction. Isolate area. Keep upwind of spill. Stay out of 

low areas. 

OSHA Hazard Communication Standard

This product is a "Hazardous Chemical" as defined by the OSHA Hazard Communication Standard, 29 

CFR 1910.1200. 

Material Safety Data Sheet

The Dow Chemical Company
Product Name: SPECFLEX* NS 1540 Isocyanate DA Issue Date: 04/17/2012

Page 2 of 10

Potential Health Effects

Eye Contact: May cause moderate eye irritation. May cause slight temporary corneal injury. 

Skin Contact: Prolonged contact may cause slight skin irritation with local redness. May stain skin. 

Skin Absorption: Prolonged skin contact is unlikely to result in absorption of harmful amounts. 

Skin Sensitization: Skin contact may cause an allergic skin reaction. Animal studies have shown that 

skin contact with isocyanates may play a role in respiratory sensitization. 

Inhalation: At room temperature, vapors are minimal due to low volatility. However, certain 

operations may generate vapor or mist concentrations sufficient to cause respiratory irritation and 

other adverse effects. Such operations include those in which the material is heated, sprayed or 

otherwise mechanically dispersed such as drumming, venting or pumping. Excessive exposure may 

cause irritation to upper respiratory tract (nose and throat) and lungs. May cause pulmonary edema 

(fluid in the lungs.) Effects may be delayed. Decreased lung function has been associated with 

overexposure to isocyanates. 

Respiratory Sensitization: May cause allergic respiratory response. MDI concentrations below the 

exposure guidelines may cause allergic respiratory reactions in individuals already sensitized. 

Asthma-like symptoms may include coughing, difficult breathing and a feeling of tightness in the chest. 

Occasionally, breathing difficulties may be life threatening. 

Ingestion: Low toxicity if swallowed. Small amounts swallowed incidentally as a result of normal 

handling operations are not likely to cause injury; however, swallowing larger amounts may cause 

injury. 

Aspiration hazard: Based on physical properties, not likely to be an aspiration hazard. 

Effects of Repeated Exposure: Tissue injury in the upper respiratory tract and lungs has been 

observed in laboratory animals after repeated excessive exposures to MDI/polymeric MDI aerosols. 

Cancer Information: Lung tumors have been observed in laboratory animals exposed to respirable 

aerosol droplets of MDI/Polymeric MDI (6 mg/m3) for their lifetime. Tumors occurred concurrently with 

respiratory irritation and lung injury. Current exposure guidelines are expected to protect against these 

effects reported for MDI. 

Birth Defects/Developmental Effects: In laboratory animals, MDI/polymeric MDI did not cause birth 

defects; other fetal effects occurred only at high doses which were toxic to the mother. 

Component CAS # Amount

Diphenylmethane Diisocyanate, isomers and homologues 9016-87-9 100.0 %

4,4' -Methylenediphenyl diisocyanate 101-68-8 > 55.0 - < 65.0 %

Note: CAS 101-68-8 is an MDI isomer that is part of CAS 9016-87-9. 

4. First-aid measures

Description of first aid measures

General advice: First Aid responders should pay attention to self-protection and use the 

recommended protective clothing (chemical resistant gloves, splash protection). If potential for 

exposure exists refer to Section 8 for specific personal protective equipment. 

Inhalation: Move person to fresh air. If not breathing, give artificial respiration; if by mouth to mouth 

use rescuer protection (pocket mask, etc). If breathing is difficult, oxygen should be administered by 

qualified personnel. Call a physician or transport to a medical facility. 

Skin Contact: Remove material from skin immediately by washing with soap and plenty of water. 

Remove contaminated clothing and shoes while washing. Seek medical attention if irritation persists. 

Wash clothing before reuse. An MDI skin decontamination study demonstrated that cleaning very 

soon after exposure is important, and that a polyglycol-based skin cleanser or corn oil may be more 

effective than soap and water. Discard items which cannot be decontaminated, including leather 

articles such as shoes, belts and watchbands. Suitable emergency safety shower facility should be 

available in work area. 

Eye Contact: Immediately flush eyes with water; remove contact lenses, if present, after the first 5 

minutes, then continue flushing eyes for at least 15 minutes. Obtain medical attention without delay, 

3. Composition Information
Product Name: SPECFLEX* NS 1540 Isocyanate DA Issue Date: 04/17/2012

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preferably from an ophthalmologist. Suitable emergency eye wash facility should be immediately 

available. 

Ingestion: If swallowed, seek medical attention. Do not induce vomiting unless directed to do so by 

medical personnel. 

Most important symptoms and effects, both acute and delayed

Aside from the information found under Description of first aid measures (above) and Indication of 

immediate medical attention and special treatment needed (below), no additional symptoms and 

effects are anticipated.

Indication of immediate medical attention and special treatment needed

Maintain adequate ventilation and oxygenation of the patient. May cause respiratory sensitization or 

asthma-like symptoms. Bronchodilators, expectorants and antitussives may be of help. Treat 

bronchospasm with inhaled beta2 agonist and oral or parenteral corticosteroids. Respiratory 

symptoms, including pulmonary edema, may be delayed. Persons receiving significant exposure 

should be observed 24-48 hours for signs of respiratory distress. If you are sensitized to 

diisocyanates, consult your physician regarding working with other respiratory irritants or sensitizers. 

Treatment of exposure should be directed at the control of symptoms and the clinical condition of the 

patient. 

Excessive exposure may aggravate preexisting asthma and other respiratory disorders (e.g. 

emphysema, bronchitis, reactive airways dysfunction syndrome). 

5. Fire Fighting Measures

Suitable extinguishing media

Water fog or fine spray. Dry chemical fire extinguishers. Carbon dioxide fire extinguishers. Foam. 

Alcohol resistant foams (ATC type) are preferred. General purpose synthetic foams (including AFFF) 

or protein foams may function, but will be less effective. 

Extinguishing Media to Avoid: Do not use direct water stream. May spread fire. 

Special hazards arising from the substance or mixture

Hazardous Combustion Products: During a fire, smoke may contain the original material in addition 

to combustion products of varying composition which may be toxic and/or irritating. Combustion 

products may include and are not limited to: Nitrogen oxides. Isocyanates. Hydrogen cyanide. 

Carbon monoxide. Carbon dioxide. 

Unusual Fire and Explosion Hazards: Product reacts with water. Reaction may produce heat and/or 

gases. This reaction may be violent. Container may rupture from gas generation in a fire situation. 

Violent steam generation or eruption may occur upon application of direct water stream to hot liquids. 

Dense smoke is produced when product burns. 

Advice for firefighters

Fire Fighting Procedures: Keep people away. Isolate fire and deny unnecessary entry. Stay 

upwind. Keep out of low areas where gases (fumes) can accumulate. Water is not recommended, but 

may be applied in large quantities as a fine spray when other extinguishing agents are not available. 

Do not use direct water stream. May spread fire. Fight fire from protected location or safe distance. 

Consider the use of unmanned hose holders or monitor nozzles. Immediately withdraw all personnel 

from the area in case of rising sound from venting safety device or discoloration of the container. 

Move container from fire area if this is possible without hazard. Use water spray to cool fire-exposed 

containers and fire-affected zone until fire is out. Contain fire water run-off if possible. Fire water runoff, if not contained, may cause environmental damage. Review the "Accidental Release Measures" 

and the "Ecological Information" sections of this (M)SDS. 

Special Protective Equipment for Firefighters: Wear positive-pressure self-contained breathing 

apparatus (SCBA) and protective fire fighting clothing (includes fire fighting helmet, coat, trousers, 

boots, and gloves). Avoid contact with this material during fire fighting operations. If contact is likely, 

change to full chemical resistant fire fighting clothing with self-contained breathing apparatus. If this is 

not available, wear full chemical resistant clothing with self-contained breathing apparatus and fight fire 
Product Name: SPECFLEX* NS 1540 Isocyanate DA Issue Date: 04/17/2012

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from a remote location. For protective equipment in post-fire or non-fire clean-up situations, refer to 

the relevant sections. 

6. Accidental Release Measures

Personal precautions, protective equipment and emergency procedures: Isolate area. Keep 

unnecessary and unprotected personnel from entering the area. Keep personnel out of low areas. 

Keep upwind of spill. Spilled material may cause a slipping hazard. Ventilate area of leak or spill. If 

available, use foam to smother or suppress. Refer to Section 7, Handling, for additional precautionary 

measures. See Section 10 for more specific information. Use appropriate safety equipment. For 

additional information, refer to Section 8, Exposure Controls and Personal Protection. 

Environmental precautions: Prevent from entering into soil, ditches, sewers, waterways and/or 

groundwater. See Section 12, Ecological Information. 

Methods and materials for containment and cleaning up: Contain spilled material if possible. 

Absorb with materials such as: Dirt. Vermiculite. Sand. Clay. Do NOT use absorbent materials such 

as: Cement powder (Note: may generate heat). Collect in suitable and properly labeled open 

containers. Do not place in sealed containers. Suitable containers include: Metal drums. Plastic 

drums. Polylined fiber pacs. Wash the spill site with large quantities of water. Attempt to neutralize 

by adding suitable decontaminant solution: Formulation 1: sodium carbonate 5 - 10%; liquid detergent 

0.2 - 2%; water to make up to 100%, OR Formulation 2: concentrated ammonia solution 3 - 8%; liquid 

detergent 0.2 - 2%; water to make up to 100%. If ammonia is used, use good ventilation to prevent 

vapor exposure. Contact Dow for clean-up assistance. See Section 13, Disposal Considerations, for 

additional information. 

7. Handling and Storage

Handling

General Handling: Avoid breathing vapor. Avoid contact with eyes. Avoid prolonged or repeated 

contact with skin. Use with adequate ventilation. Wash thoroughly after handling. Keep container 

tightly closed. See Section 8, EXPOSURE CONTROLS AND PERSONAL PROTECTION. 

Other Precautions: Spills of these organic materials on hot fibrous insulations may lead to lowering of 

the autoignition temperatures possibly resulting in spontaneous combustion. 

Storage

Store in a dry place. Protect from atmospheric moisture. Do not store product contaminated with 

water to prevent potential hazardous reaction. See Section 10 for more specific information. 

Additional storage and handling information on this product may be obtained by calling your sales or 

customer service contact. 

Shelf life: Use within Storage temperature:

6 Months 25 - 35 °C

8. Exposure Controls / Personal Protection

Exposure Limits

Component List Type Value

|

4,4' -Methylenediphenyl 

diisocyanate

ACGIH TWA 0.005 ppm 

OSHA Table 

Z-1

Ceiling 0.2 mg/m3 0.02 ppm 
Product Name: SPECFLEX* NS 1540 Isocyanate DA Issue Date: 04/17/2012

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Personal Protection

Eye/Face Protection: Use chemical goggles. 

Skin Protection: Use protective clothing chemically resistant to this material. Selection of specific 

items such as face shield, boots, apron, or full body suit will depend on the task. 

Hand protection: Use gloves chemically resistant to this material. Examples of preferred 

glove barrier materials include: Butyl rubber. Polyethylene. Chlorinated polyethylene. Ethyl 

vinyl alcohol laminate ("EVAL"). Examples of acceptable glove barrier materials include: 

Viton. Neoprene. Polyvinyl chloride ("PVC" or "vinyl"). Nitrile/butadiene rubber ("nitrile" or 

"NBR"). NOTICE: The selection of a specific glove for a particular application and duration of 

use in a workplace should also take into account all relevant workplace factors such as, but 

not limited to: Other chemicals which may be handled, physical requirements (cut/puncture 

protection, dexterity, thermal protection), potential body reactions to glove materials, as well as 

the instructions/specifications provided by the glove supplier. 

Respiratory Protection: Atmospheric levels should be maintained below the exposure guideline. 

When atmospheric levels may exceed the exposure guideline, use an approved air-purifying respirator 

equipped with an organic vapor sorbent and a particle filter. For situations where the atmospheric 

levels may exceed the level for which an air-purifying respirator is effective, use a positive-pressure 

air-supplying respirator (air line or self-contained breathing apparatus). For emergency response or 

for situations where the atmospheric level is unknown, use an approved positive-pressure selfcontained breathing apparatus or positive-pressure air line with auxiliary self-contained air supply. The 

following should be effective types of air-purifying respirators: Organic vapor cartridge with a 

particulate pre-filter. 

Ingestion: Use good personal hygiene. Do not consume or store food in the work area. Wash hands 

before smoking or eating. 

Engineering Controls

Ventilation: Use only with adequate ventilation. Provide general and/or local exhaust ventilation to 

control airborne levels below the exposure guidelines. Exhaust systems should be designed to move 

the air away from the source of vapor/aerosol generation and people working at this point. The odor 

and irritancy of this material are inadequate to warn of excessive exposure. Local exhaust ventilation 

may be necessary for some operations. 

9. Physical and Chemical Properties

Appearance

 Physical State Liquid.

 Color Brown

Odor Musty

Odor Threshold 0.4 ppm Literature Odor is inadequate warning of excessive exposure.

pH Not applicable

Melting Point No test data available

Freezing Point forms crystals below 10oC

Boiling Point (760 mmHg) > 300 °C (> 572 °F) EC Method A2 . 

Flash Point - Closed Cup > 200 °C (> 392 °F) EC Method A9

Evaporation Rate (Butyl 

Acetate = 1)

No test data available

Flammability (solid, gas) Not applicable to liquids 

Flammable Limits In Air Lower: No test data available 

Upper: No test data available 

Vapor Pressure < 0.0009 hPa @ 20 °C EC Method A4 

Vapor Density (air = 1) 8.5 Literature

Specific Gravity (H2O = 1) 1.18 - 1.24 20 °C/20 °C Measured 

Solubility in water (by 

weight)

6.8 mg/l @ 25 °C Estimated. (reacts with evolution of CO2)

Partition coefficient, noctanol/water (log Pow)

Reacts with water.

Autoignition Temperature > 600 °C (> 1,112 °F) EC Method A15

Decomposition 

Temperature

> 230 °C(> 446 °F) Literature
Product Name: SPECFLEX* NS 1540 Isocyanate DA Issue Date: 04/17/2012

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Dynamic Viscosity 40 - 60 cPs @ 25 °C ASTM D4889

Kinematic Viscosity No test data available

Explosive properties Not explosive 

Oxidizing properties No 

Molecular Weight No test data available

10. Stability and Reactivity

Reactivity

Diisocyanates react with many materials and the rate of reaction increases with temperature as well as 

increased contact; these reactions can become violent. Contact is increased by stirring or if the other 

material mixes with the diisocyanate., Diisocyanates are not soluble in water and sink to the bottom, 

but react slowly at the interface. The reaction forms carbon dioxide gas and a layer of solid polyurea., 

Reaction with water will generate carbon dioxide and heat. 

Chemical stability

Stable under recommended storage conditions. See Storage, Section 7. 

Possibility of hazardous reactions

Can occur. Elevated temperatures can cause hazardous polymerization. Polymerization can be 

catalyzed by: Strong bases. Water. 

Conditions to Avoid: Exposure to elevated temperatures can cause product to decompose. 

Generation of gas during decomposition can cause pressure in closed systems. Pressure build-up 

can be rapid. Avoid moisture. Material reacts slowly with water, releasing carbon dioxide which can 

cause pressure buildup and rupture of closed containers. Elevated temperatures accelerate this 

reaction. 

Incompatible Materials: Avoid contact with: Acids. Alcohols. Amines. Water. Ammonia. Bases. 

Metal compounds. Moist air. Strong oxidizers. Diisocyanates react with many materials and the rate 

of reaction increases with temperature as well as increased contact; these reactions can become 

violent. Contact is increased by stirring or if the other material mixes with the diisocyanate. 

Diisocyanates are not soluble in water and sink to the bottom, but react slowly at the interface. The 

reaction forms carbon dioxide gas and a layer of solid polyurea. Reaction with water will generate 

carbon dioxide and heat. Avoid contact with metals such as: Aluminum. Zinc. Brass. Tin. Copper. 

Galvanized metals. Avoid contact with absorbent materials such as: Moist organic absorbents. Avoid 

unintended contact with polyols. The reaction of polyols and isocyanates generate heat. 

Hazardous decomposition products

Decomposition products depend upon temperature, air supply and the presence of other materials. 

Gases are released during decomposition. 

11. Toxicological Information

Acute Toxicity

Ingestion

Typical for this family of materials. LD50, rat > 10,000 mg/kg

Dermal

Typical for this family of materials. LD50, rabbit > 9,400 mg/kg

Inhalation

LC50, 4 h, Aerosol, rat 0.49 mg/l

For similar material(s): 2,4'-Diphenylmethane diisocyanate (CAS 5873-54-1). LC50, 4 h, Aerosol, rat

0.31 mg/l

For similar material(s): 4,4'-Methylenediphenyl diisocyanate (CAS 101-68-8). LC50, 1 h, Aerosol, rat

2.24 mg/l

Eye damage/eye irritation
Product Name: SPECFLEX* NS 1540 Isocyanate DA Issue Date: 04/17/2012

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May cause moderate eye irritation. May cause slight temporary corneal injury. 

Skin corrosion/irritation

Prolonged contact may cause slight skin irritation with local redness. May stain skin. 

Sensitization

Skin

Skin contact may cause an allergic skin reaction. Animal studies have shown that skin contact with 

isocyanates may play a role in respiratory sensitization. 

Respiratory

May cause allergic respiratory response. MDI concentrations below the exposure guidelines may 

cause allergic respiratory reactions in individuals already sensitized. Asthma-like symptoms may 

include coughing, difficult breathing and a feeling of tightness in the chest. Occasionally, breathing 

difficulties may be life threatening. 

Repeated Dose Toxicity

Tissue injury in the upper respiratory tract and lungs has been observed in laboratory animals after 

repeated excessive exposures to MDI/polymeric MDI aerosols. 

Chronic Toxicity and Carcinogenicity

Lung tumors have been observed in laboratory animals exposed to respirable aerosol droplets of 

MDI/Polymeric MDI (6 mg/m3) for their lifetime. Tumors occurred concurrently with respiratory 

irritation and lung injury. Current exposure guidelines are expected to protect against these effects 

reported for MDI. 

Developmental Toxicity

In laboratory animals, MDI/polymeric MDI did not cause birth defects; other fetal effects occurred only 

at high doses which were toxic to the mother. 

Reproductive Toxicity

No relevant data found. 

Genetic Toxicology

Genetic toxicity data on MDI are inconclusive. MDI was weakly positive in some in vitro studies; other 

in vitro studies were negative. Animal mutagenicity studies were predominantly negative. 

12. Ecological Information

Toxicity

The measured ecotoxicity is that of the hydrolyzed product, generally under conditions maximizing 

production of soluble species. Material is practically non-toxic to aquatic organisms on an acute basis 

(LC50/EC50/EL50/LL50 >100 mg/L in the most sensitive species tested). 

Fish Acute & Prolonged Toxicity

LC50, Danio rerio (zebra fish), static test, 96 h: > 1,000 mg/l

Aquatic Invertebrate Acute Toxicity

EC50, Daphnia magna (Water flea), static test, 24 h: > 1,000 mg/l

Aquatic Plant Toxicity

NOEC, Scenedesmus subspicatus (new name: Desmodesmus subspicatus), static test, Growth rate 

inhibition, 72 h: 1,640 mg/l

Toxicity to Micro-organisms

EC50; activated sludge, static test, 3 h: > 100 mg/l

Toxicity to Soil Dwelling Organisms

EC50, Eisenia fetida (earthworms), 14 d: > 1,000 mg/kg

Persistence and Degradability

In the aquatic and terrestrial environment, material reacts with water forming predominantly insoluble 

polyureas which appear to be stable. In the atmospheric environment, material is expected to have a 

short tropospheric half-life, based on calculations and by analogy with related diisocyanates. 

OECD Biodegradation Tests:

Biodegradation Exposure Time Method 10 Day Window

0 % 28 d OECD 302C Test Not applicable
Product Name: SPECFLEX* NS 1540 Isocyanate DA Issue Date: 04/17/2012

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Bioaccumulative potential

Bioaccumulation: In the aquatic and terrestrial environment, movement is expected to be limited by 

its reaction with water forming predominantly insoluble polyureas. 

Mobility in soil

Mobility in soil: In the aquatic and terrestrial environment, movement is expected to be limited by its 

reaction with water forming predominantly insoluble polyureas.

13. Disposal Considerations

DO NOT DUMP INTO ANY SEWERS, ON THE GROUND, OR INTO ANY BODY OF WATER. All 

disposal practices must be in compliance with all Federal, State/Provincial and local laws and 

regulations. Regulations may vary in different locations. Waste characterizations and compliance with 

applicable laws are the responsibility solely of the waste generator. AS YOUR SUPPLIER, WE HAVE 

NO CONTROL OVER THE MANAGEMENT PRACTICES OR MANUFACTURING PROCESSES OF 

PARTIES HANDLING OR USING THIS MATERIAL. THE INFORMATION PRESENTED HERE 

PERTAINS ONLY TO THE PRODUCT AS SHIPPED IN ITS INTENDED CONDITION AS 

DESCRIBED IN MSDS SECTION: Composition Information. FOR UNUSED & UNCONTAMINATED 

PRODUCT, the preferred options include sending to a licensed, permitted: Recycler. Reclaimer. 

Incinerator or other thermal destruction device. For additional information, refer to: Handling & 

Storage Information, MSDS Section 7 Stability & Reactivity Information, MSDS Section 10 Regulatory 

Information, MSDS Section 15 

14. Transport Information

DOT Non-Bulk

NOT REGULATED

DOT Bulk

Proper Shipping Name: OTHER REGULATED SUBSTANCE,LIQUID,N.O.S.

Technical Name: MDI

Hazard Class: 9 ID Number: NA3082 Packing Group: PG III

IMDG

NOT REGULATED

ICAO/IATA

NOT REGULATED

Additional Information

Reportable quantity: 5,000 lb – MDI, – RQ based on 172.101 Appendix A for pure MDI

This information is not intended to convey all specific regulatory or operational 

requirements/information relating to this product. Additional transportation system information can be 

obtained through an authorized sales or customer service representative. It is the responsibility of the 

transporting organization to follow all applicable laws, regulations and rules relating to the 

transportation of the material. 

15. Regulatory Information

OSHA Hazard Communication Standard
Product Name: SPECFLEX* NS 1540 Isocyanate DA Issue Date: 04/17/2012

Page 9 of 10

This product is a "Hazardous Chemical" as defined by the OSHA Hazard Communication Standard, 29 

CFR 1910.1200.

Superfund Amendments and Reauthorization Act of 1986 Title III (Emergency Planning 

and Community Right-to-Know Act of 1986) Sections 311 and 312

Immediate (Acute) Health Hazard Yes

Delayed (Chronic) Health Hazard Yes

Fire Hazard No

Reactive Hazard Yes

Sudden Release of Pressure Hazard No

Superfund Amendments and Reauthorization Act of 1986 Title III (Emergency Planning and 

Community Right-to-Know Act of 1986) Section 313

This product contains the following substances which are subject to the reporting requirements of 

Section 313 of Title III of the Superfund Amendments and Reauthorization Act of 1986 and which are 

listed in 40 CFR 372.

Component CAS # Amount

Diphenylmethane Diisocyanate, isomers and 

homologues

9016-87-9 100.0%

4,4' -Methylenediphenyl diisocyanate 101-68-8 > 55.0 - < 65.0 %

Pennsylvania (Worker and Community Right-To-Know Act): Pennsylvania Hazardous 

Substances List and/or Pennsylvania Environmental Hazardous Substance List:

The following product components are cited in the Pennsylvania Hazardous Substance List and/or the 

Pennsylvania Environmental Substance List, and are present at levels which require reporting.

Component CAS # Amount

Diphenylmethane Diisocyanate, isomers and 

homologues

9016-87-9 100.0%

4,4' -Methylenediphenyl diisocyanate 101-68-8 > 55.0 - < 65.0 %

Pennsylvania (Worker and Community Right-To-Know Act): Pennsylvania Special Hazardous 

Substances List:

To the best of our knowledge, this product does not contain chemicals at levels which require reporting 

under this statute.

Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA) 

Section 103

This product contains the following substances which are subject to CERCLA Section 103 reporting 

requirements and which are listed in 40 CFR 302.4.

Component CAS # Amount

Diphenylmethane Diisocyanate, isomers and 

homologues

9016-87-9 100.0%

4,4' -Methylenediphenyl diisocyanate 101-68-8 > 55.0 - < 65.0 %

California Proposition 65 (Safe Drinking Water and Toxic Enforcement Act of 1986)

This product contains no listed substances known to the State of California to cause cancer, birth 

defects or other reproductive harm, at levels which would require a warning under the statute.

US. Toxic Substances Control Act

All components of this product are on the TSCA Inventory or are exempt from TSCA Inventory 

requirements under 40 CFR 720.30

CEPA - Domestic Substances List (DSL)

All substances contained in this product are listed on the Canadian Domestic Substances List (DSL) or 

are not required to be listed.
Product Name: SPECFLEX* NS 1540 Isocyanate DA Issue Date: 04/17/2012

Page 10 of 10

16. Other Information

Product Literature

Additional information on this product may be obtained by calling your sales or customer service 

contact.

Recommended Uses and Restrictions

Identified uses

Component(s) for the manufacture of urethane polymers. We recommend that you use this product in 

a manner consistent with the listed use. If your intended use is not consistent with the stated use, 

please contact your sales or technical service representative. 

Revision

Identification Number: 50859 / 0000 / Issue Date 04/17/2012 / Version: 6.0

Most recent revision(s) are noted by the bold, double bars in left-hand margin throughout this 

document. 

Legend

N/A Not available

W/W Weight/Weight

OEL Occupational Exposure Limit

STEL Short Term Exposure Limit

TWA Time Weighted Average

ACGIH American Conference of Governmental Industrial Hygienists, Inc.

DOW IHG Dow Industrial Hygiene Guideline

WEEL Workplace Environmental Exposure Level

HAZ_DES Hazard Designation

Action Level A value set by OSHA that is lower than the PEL which will trigger the need for 

activities such as exposure monitoring and medical surveillance if exceeded.

The Dow Chemical Company urges each customer or recipient of this (M)SDS to study it carefully and 

consult appropriate expertise, as necessary or appropriate, to become aware of and understand the 

data contained in this (M)SDS and any hazards associated with the product. The information herein is 

provided in good faith and believed to be accurate as of the effective date shown above. However, no 

warranty, express or implied, is given. Regulatory requirements are subject to change and may differ 

between various locations. It is the buyer's/user's responsibility to ensure that his activities comply with 

all federal, state, provincial or local laws. The information presented here pertains only to the product 

as shipped. Since conditions for use of the product are not under the control of the manufacturer, it is 

the buyer's/user's duty to determine the conditions necessary for the safe use of this product. Due to 

the proliferation of sources for information such as manufacturer-specific (M)SDSs, we are not and 

cannot be responsible for (M)SDSs obtained from any source other than ourselves. If you have 

obtained an (M)SDS from another source or if you are not sure that the (M)SDS you have is current, 

please contact us for the most current version.